But Mbeki told reporters that the negotiators will be adjourning for a few days to allow them to return to Zimbabwe to consult with their leaders.

A Movement for Democratic Change opposition official said on Monday that talks in Pretoria were deadlocked because the MDC could not accept an offer for its leader, Morgan Tsvangirai, to be vice president of a unity government.

"They are continuing to talk. They haven't concluded and they will be adjourning shortly for a couple of days because they want to go to Harare and consult with their principals. And then they will come back by the end of the week," Mbeki told reporters in Pretoria.

Tsvangirai won a first round presidential vote on March 29 but pulled out of the June 27 second round citing systematic violence which the MDC says has killed 120 of its supporters.

The MDC says only Tsvangirai can lead a new government.

Mbeki, who is mediating the talks, said the two sides were determined to keep to a two-week timetable agreed under a deal on the framework for discussions signed on July 21.

"They are doing very well... they undertook that they would try and conclude the negotiations within two weeks of the signing... They are indeed very determined to keep to that commitment and so they are continuing to talk among themselves and indeed to reach agreements about various matters that are on their agenda," Mbeki said.

UNITY GOVERNMENT

Both Mugabe and Tsvangirai are under heavy international pressure, including from within Africa, to negotiate a national unity government to end a crisis that has ruined the economy and flooded neighbouring states with millions of refugees.

Senior negotiators from ZANU-PF and the MDC started full talks last Thursday.

The MDC official said Tsvangirai would meet his negotiators on Tuesday, before proceeding to a meeting of the Southern Africa Development Community (SADC)'s committee on politics, defence and security in Angola on Wednesday.

Deeply concerned by the violence and the economic crisis, SADC and the African Union (AU) are pushing for a power-sharing deal in Zimbabwe.

The southern African grouping appointed Mbeki as Zimbabwe mediator last year.

ZANU-PF has said it will not accept any deal that fails to recognise Mugabe's re-election or seeks to reverse his land redistribution programme, under which the government has seized thousands of white-owned farms since 2000.

Critics say the farm seizures helped wreck the once prosperous economy and bring food shortages and inflation now running at over 2 million percent, but the opposition has said it would not go back on the land seizures.

The parties also disagree over how long a national unity government should remain in power. Tsvangirai's MDC wants fresh elections held as soon as possible, while Mugabe, who has ruled since 1980, wants to carry on with his new five-year mandate.